hooman

mixer with 5 tubes
« on: February 28, 2019, 01:48:11 PM »
hi
this is my first post .   analog tube mixer Simple, But Not Easy .  my plane  :4 mono  input just control by  one switch.2 mono  input  with mix  pot  and  pan control . 3 mono  input with   mix pot .and  2 stereo input  with  mix pot .used  1 x 12au7 in mono   section for best stereo  signal . .2x12av7 for  EQ amp  and main  process  of  stereo  signal .2x12fq7 for out put in low impedance.


« Last Edit: March 05, 2019, 12:57:47 AM by hooman »


hooman

Re: mixer with 5 tubes
« Reply #1 on: February 28, 2019, 01:58:10 PM »


.for  best result in hum  i used  dc  for  all  filaments .  ac  transformer  fixed in back of  box .

hooman

Re: mixer with 5 tubes
« Reply #2 on: February 28, 2019, 02:10:12 PM »


 i  don't   use  audio  transformer  in  this project . when i start  to  build  this mixer  first searching  for  good circuit with  no transformer  in input and output and  simple  in EQ.

hooman

Re: mixer with 5 tubes
« Reply #3 on: February 28, 2019, 03:11:42 PM »

test  10 khz  in  sum  mixer ....... EQ  circuit  can check  by osiloscop  for best result .

hooman

Re: mixer with 5 tubes
« Reply #4 on: March 01, 2019, 01:53:51 AM »


EQ  circuit  can   change  frequency   of  all in put  in main mixer  amp .there is 4 separate  sections by   keys and pots for  control frequency   , user    can  cancel eq  circuit  and signal  receive to output without any  change .
this is very  simple  .   :)
« Last Edit: March 06, 2019, 01:01:12 PM by hooman »

hooman

Re: mixer with 5 tubes
« Reply #5 on: March 01, 2019, 07:51:43 AM »
  we can meet  world class engineers in mixers  and analog record gear  like  mr Ian Thompson-Bell  in this nice  place . so i am waiting for  good advise  before  complete my  project . :) :)

hooman

Re: mixer with 5 tubes
« Reply #6 on: March 01, 2019, 01:33:07 PM »
20 hz to 45  khz  in stereo and  30 t0 25 khz in mono  ,,,,,,,,,,  i used  small tube amp pcl86  for monitoring . i  found this kind of tube mixer in internet .never  found  circuit diagram ....  just  2  low resolution inside pictures  of new   made mixer .it was not  so easy to understand  which topology  that designer used   for eq ?

ruffrecords

Re: mixer with 5 tubes
« Reply #7 on: March 02, 2019, 06:42:13 PM »
I think you have done very well to extract all this information from a couple of pictures. Well done.

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

hooman

Re: mixer with 5 tubes
« Reply #8 on: March 03, 2019, 01:03:25 AM »
I think you have done very well to extract all this information from a couple of pictures. Well done.

Cheers

Ian
Thank you for showing   the  art of    tubes  in audio     . This is most  important....when i saw your   pages in inter net  i  understand  why  analog tube mixer is alive?......why modern  circuit  with  vacuum tubes  can  improve quality  in  studio ...?
simple but  not so easy . in my country we   don't have  easy  access to    all parts  like other in world. :(  but  love  the tubes  magic .10 years before  i started to  buy  tubes . i have  more audio tubes  ..some times  buy   audio transformer  for  tube mic preamp.
 again thanks  to you  :) :)

hooman

Re: mixer with 5 tubes
« Reply #9 on: March 04, 2019, 09:54:10 AM »
i was member of  famous  diy  forums  sins 2008 ...but to day find this place with professional peoples  :)  this  forum is very strong but  very   friendly and easy   to use for members and visitors!!!!!!!!!!! .before our king   buy best of any product  for  us .

so  to day i have more than 1000 of tubes liks rca 2a3 .....u52 from uk .....6550 tung sol  ..12ax7 tele . 211 of usa ......gz32 mullard ...and ...and
i have experience with  tubes in  high gain circuit in guitar amp ....   tube mic   preamps ...hifi amps ....
i am working in  panasonic  service as technical manager for 10 years .and  10 years  in sony as technical center in audio .
noting  dangerous for other people . ;)




hooman

Re: mixer with 5 tubes
« Reply #10 on: March 04, 2019, 03:38:06 PM »

most important  point for tube mixer  project  is hum  ::)  in project s  without pcb  ... can  test  and find best grounds point , for  removing hum .i used  amps with  gain to hearing hum  when all pots in max  position . ::)
« Last Edit: March 04, 2019, 11:55:28 PM by hooman »

hooman

Re: mixer with 5 tubes
« Reply #11 on: March 04, 2019, 03:45:51 PM »


 2x12fq7  in parallel  triodes for  low out put impedance.nice tubes  good sound.

hooman

Re: mixer with 5 tubes
« Reply #12 on: March 04, 2019, 03:53:17 PM »

    pair    of 12av7 used in hart of mixer.
« Last Edit: March 06, 2019, 01:09:31 AM by hooman »

hooman

Re: mixer with 5 tubes
« Reply #13 on: March 07, 2019, 10:58:13 AM »



hooman

Re: mixer with 5 tubes
« Reply #14 on: March 13, 2019, 12:30:35 PM »


this analog tube mixer  is simple but very useful and sound is amazing .
 no inexpensive audio transformers ...good  eq circuit.....harmonic
The EQ section :low  boost- hi  boost -low  cut -
hi  cut.
The harmonic  control increases gain and harmonic
tube  sound ... :) for  tube lovers .
12fq7  good for out put ....12av7  has enough   gain for  eq circuit ;)....12au7  good for mono mixing in stereo mixer . 


hooman

Re: mixer with 5 tubes
« Reply #15 on: March 16, 2019, 01:15:42 AM »


for panning  i used   mn pots .

ruffrecords

Re: mixer with 5 tubes
« Reply #16 on: March 16, 2019, 04:23:53 AM »
What are mn pots?

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

hooman

Re: mixer with 5 tubes
« Reply #17 on: March 19, 2019, 12:01:55 PM »
What are mn pots?

Cheers

Ian

hi...  i am   sorry.... :-[ mn taper pots   ....not brand . :)

« Last Edit: March 19, 2019, 12:09:18 PM by hooman »

ruffrecords

Re: mixer with 5 tubes
« Reply #18 on: March 19, 2019, 05:50:41 PM »
hi...  i am   sorry.... :-[ mn taper pots   ....not brand . :)


Cool never heard of Bourns MN taper before. Thanks for that.

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

Phrazemaster

Re: mixer with 5 tubes
« Reply #19 on: April 11, 2019, 07:47:47 PM »
Dude! You’re a force of nature! Fabulous work!!!

Welcome (back?) to the forum!

Mike
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** * Kablooie!


 

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